$ cat writeup.md…
$ cat writeup.md…
HITCON 2026
Task: A custom SPI TPM protects an unaffordable high-COST ciphertext but leaks nine bits of a bilinear modular form per response. Solution: collect 27 same-key pairs, enumerate a centered CVP lattice, apply the product constraint, verify with cost-1 samples, and invert the cipher offline.
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